The following question has two parts. first, answer part a. then, answer part b.

part a:

in the section titled "microwave ovens," what made the microwave oven such an "essential part" of the author's lunch period?

a. the author had only a short lunch period, and it was difficult to clean up dishes after heating lunch using saucepans.

b. the meals made for microwaves came pre-packaged, making it easy to consume in a short amount of time.

c. the microwave had settings that were perfect for reheating leftovers the author brought to work from home.

d. the microwave cooked things much faster than the traditional toaster oven that it had replaced.